Contacts of the helix formed by residues 164 - 185 (chain A) in PDB entry 1Z6Z


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with TRP 164 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LEU*     4.8     5.4    -      -       +      -
    104A  VAL*     3.6    23.1    -      -       +      +
    156A  CYS*     3.6    32.5    -      -       -      -
    161A  PHE*     3.1    29.6    +      +       +      +
    162A  LYS      3.6    10.1    +      -       -      -
    163A  GLY*     1.3    85.7    -      -       -      +
    165A  ALA*     1.3    63.7    +      -       -      +
    166A  LEU      3.4     2.5    -      -       -      -
    167A  TYR*     3.3    16.3    +      +       +      -
    168A  CYS*     2.9    28.6    +      -       -      +
    203A  GLN*     5.9     3.1    -      -       -      -
    206A  ALA*     3.6    28.9    -      -       +      -
    210A  SER*     3.1    24.5    +      -       -      -
    215A  MET*     4.2    17.1    -      -       +      +
    219A  LEU*     4.1    19.1    -      -       +      -
    407A   CL      4.4    10.3    -      -       +      -
    180B  VAL*     4.2     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 165 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108A  PHE*     3.9    20.0    -      -       +      -
    111A  LEU*     4.0    14.6    -      -       +      +
    163A  GLY      3.5     3.6    +      -       -      -
    164A  TRP*     1.3    75.8    -      -       -      +
    166A  LEU*     1.3    58.0    +      -       -      +
    168A  CYS*     4.1     0.7    -      -       -      +
    169A  ALA*     2.9    32.6    +      -       -      +
    177B  LEU*     3.6    20.0    -      -       +      +
    180B  VAL*     3.7    28.3    -      -       +      +
    184B  GLU*     4.9     2.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 166 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  LEU      5.0     2.7    -      -       -      +
    102A  GLY*     5.2     7.4    -      -       -      -
    103A  ASP      5.3     4.3    -      -       -      +
    111A  LEU*     4.1    26.4    -      -       +      +
    116A  GLN*     4.9     7.0    -      -       +      +
    117A  VAL*     4.1    15.9    -      -       +      -
    120A  TYR*     3.3    47.3    -      -       +      -
    121A  TRP*     3.7    24.5    -      -       +      -
    164A  TRP      3.4     0.2    -      -       -      -
    165A  ALA*     1.3    78.8    -      -       -      +
    167A  TYR*     1.3    59.1    +      -       -      +
    169A  ALA*     3.9     0.7    -      -       -      +
    170A  GLY      2.9    24.6    +      -       -      -
    129B  LEU*     3.6    30.7    -      -       +      -
    177B  LEU*     4.8     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 167 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100A  SER      3.5    23.6    -      -       -      -
    101A  LEU*     3.6    33.9    +      -       +      +
    104A  VAL*     5.5     0.2    -      -       +      -
    120A  TYR*     3.4     8.4    +      -       -      -
    154A  SER*     3.8     3.2    -      -       -      -
    156A  CYS*     3.7    37.5    -      -       +      -
    164A  TRP*     3.3    17.8    +      +       +      +
    166A  LEU*     1.3    79.1    -      -       -      +
    168A  CYS*     1.3    61.6    +      -       -      +
    170A  GLY*     3.3     1.9    +      -       -      -
    171A  LYS*     2.9    40.1    +      -       +      +
    202A  MET*     4.1    11.1    -      -       -      -
    407A   CL      3.4    23.4    -      -       +      +
    801A  NAP      2.7    41.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 168 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  CYS*     3.5    30.3    -      -       -      +
    159A  GLN      3.6    22.2    -      -       -      -
    160A  PRO*     4.1     0.4    -      -       -      -
    161A  PHE*     3.8    17.9    -      -       -      -
    164A  TRP*     2.9    32.2    +      -       -      +
    167A  TYR*     1.3    72.2    -      -       -      +
    169A  ALA*     1.3    58.2    +      -       -      +
    171A  LYS      3.3     0.7    +      -       -      -
    172A  ALA*     2.9    31.2    +      -       -      +
    176B  MET*     3.4    22.4    -      -       +      +
    180B  VAL*     4.0     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 169 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  TRP*     3.9    15.0    -      -       +      -
    165A  ALA      2.9    19.0    +      -       -      +
    168A  CYS*     1.3    76.0    -      -       -      +
    170A  GLY*     1.3    56.9    -      -       -      +
    172A  ALA*     3.3     1.7    +      -       -      +
    173A  ALA*     3.0    29.8    +      -       -      +
    173B  ALA*     3.5    18.5    -      -       +      +
    176B  MET*     3.6    12.2    -      -       -      +
    177B  LEU*     3.6    30.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 170 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  TYR*     4.8     7.4    -      -       -      -
    121A  TRP*     4.0     9.3    -      -       -      -
    124A  ASN*     5.4     3.1    -      -       -      -
    125A  LEU*     3.4    16.0    -      -       -      +
    166A  LEU      2.9    18.0    +      -       -      -
    167A  TYR      3.7     0.9    -      -       -      -
    169A  ALA*     1.3    75.2    -      -       -      +
    171A  LYS*     1.3    58.0    +      -       -      +
    173A  ALA      3.3     0.5    +      -       -      -
    174A  ARG*     2.9    39.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 171 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99A  GLY*     5.3     2.8    -      -       -      -
    124A  ASN*     5.6     1.6    +      -       -      -
    152A  ILE      2.8    27.5    +      -       -      +
    153A  SER*     4.2    13.0    -      -       -      -
    154A  SER*     4.0    13.0    -      -       -      -
    156A  CYS*     4.2     1.1    -      -       +      -
    157A  ALA*     3.5    33.2    -      -       +      +
    167A  TYR*     2.9    39.7    +      -       +      +
    168A  CYS      3.8     1.1    -      -       -      +
    170A  GLY*     1.3    73.1    -      -       -      +
    172A  ALA*     1.3    65.6    +      -       -      +
    174A  ARG*     3.6    26.6    -      -       +      +
    175A  ASP*     3.0    21.7    +      -       -      +
    801A  NAP      3.0    38.4    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 172 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  ALA*     3.7    24.0    -      -       -      +
    168A  CYS      2.9    17.4    +      -       -      +
    169A  ALA      3.8     4.0    -      -       -      +
    170A  GLY      3.3     0.2    -      -       -      -
    171A  LYS*     1.3    78.2    -      -       -      +
    173A  ALA*     1.3    60.3    +      -       -      +
    175A  ASP*     3.5     3.6    +      -       -      +
    176A  MET*     3.2    23.0    +      -       -      +
    172B  ALA*     4.0    18.7    -      -       +      +
    176B  MET*     4.0    20.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 173 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LEU*     3.5    27.1    -      -       +      -
    169A  ALA      3.0    17.9    +      -       -      +
    172A  ALA*     1.3    74.3    -      -       -      +
    174A  ARG*     1.3    59.3    +      -       -      +
    176A  MET*     3.1     2.0    +      -       -      -
    177A  LEU*     2.9    34.1    +      -       -      +
    121B  TRP*     5.3     0.2    -      -       +      -
    169B  ALA*     3.6    35.1    -      -       +      +
    173B  ALA*     4.0     6.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 174 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  ASN*     3.2    29.1    +      -       -      +
     98A  ALA      3.9    18.1    +      -       -      -
    123A  LEU      5.0     0.6    +      -       -      -
    124A  ASN*     2.8    49.2    +      -       -      +
    125A  LEU*     3.8     5.8    -      -       +      -
    128A  MET*     3.5    30.4    -      -       +      +
    151A  ASN*     2.9    39.9    +      -       -      +
    152A  ILE      3.6     7.5    +      -       -      -
    170A  GLY      2.9    23.6    +      -       -      +
    171A  LYS*     3.6    30.8    -      -       -      +
    173A  ALA*     1.3    73.9    -      -       -      +
    175A  ASP*     1.3    65.2    +      -       -      +
    177A  LEU*     3.3    10.9    +      -       -      +
    178A  PHE*     3.1    25.8    +      -       -      +
    801A  NAP      4.5     1.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 175 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    151A  ASN*     3.0    14.9    +      -       -      -
    153A  SER*     2.6    26.1    +      -       -      -
    157A  ALA*     3.7    12.0    -      -       +      +
    158A  LEU*     4.7     5.0    -      -       +      +
    171A  LYS      3.0    13.3    +      -       -      +
    172A  ALA*     3.7     5.2    -      -       -      +
    174A  ARG*     1.3    75.7    -      -       -      +
    176A  MET*     1.3    58.3    +      -       -      +
    178A  PHE      3.4     0.5    +      -       -      -
    179A  GLN*     2.9    36.0    +      -       -      +
    192A  ASN*     3.4    24.4    +      -       -      +
    252A  HIS*     2.8    34.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 176 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172A  ALA      3.2    16.1    +      -       -      +
    173A  ALA      3.1     5.2    +      -       -      +
    175A  ASP*     1.3    73.5    -      -       -      +
    177A  LEU*     1.3    66.4    +      -       -      +
    179A  GLN*     3.2    16.0    +      -       -      +
    180A  VAL*     3.0    22.6    +      -       +      +
    156B  CYS      3.8     7.6    -      -       -      +
    157B  ALA      3.6    23.6    -      -       -      +
    158B  LEU      3.8    22.7    -      -       -      +
    159B  GLN      3.9     2.7    -      -       -      +
    160B  PRO*     3.9    24.7    -      -       +      -
    168B  CYS*     3.5    40.4    -      -       +      +
    169B  ALA*     3.7     3.4    -      -       -      +
    172B  ALA*     4.1     9.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 177 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125A  LEU*     4.6     9.9    -      -       +      +
    128A  MET*     4.1    21.5    -      -       -      -
    129A  LEU*     4.1    36.6    -      -       +      -
    173A  ALA      2.9    19.8    +      -       -      +
    174A  ARG*     3.6     9.2    -      -       -      +
    176A  MET*     1.3    75.4    -      -       -      +
    178A  PHE*     1.3    63.5    +      -       +      +
    180A  VAL*     3.1     9.8    +      -       -      +
    181A  LEU      2.9    23.0    +      -       -      -
    108B  PHE*     3.5    14.2    -      -       +      -
    121B  TRP*     4.6    10.5    -      -       +      -
    165B  ALA*     3.7    34.8    -      -       +      +
    166B  LEU      4.6     1.3    -      -       -      +
    169B  ALA*     3.7    10.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 178 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96A  ASN*     3.4    23.8    -      -       -      -
    128A  MET*     3.6    26.0    -      -       +      -
    132A  THR*     3.5    29.2    -      -       +      -
    149A  VAL*     3.6    17.3    -      -       +      -
    150A  VAL      3.7     3.8    -      -       -      -
    151A  ASN*     3.5    34.3    -      -       +      -
    174A  ARG      3.1     6.9    +      -       -      +
    175A  ASP      3.8     0.4    -      -       -      +
    177A  LEU*     1.3    83.6    -      -       +      +
    179A  GLN*     1.3    61.4    +      -       -      +
    181A  LEU*     3.4     9.2    +      -       +      +
    182A  ALA*     2.9    24.9    +      -       -      +
    190A  VAL*     3.4    32.9    -      -       +      +
    191A  LEU      4.1     1.6    -      -       -      -
    192A  ASN*     3.4    22.4    -      -       -      +
    108B  PHE*     4.6     4.7    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 179 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175A  ASP*     2.9    27.8    +      -       -      +
    176A  MET*     3.2    28.3    +      -       -      +
    178A  PHE*     1.3    76.4    -      -       -      +
    180A  VAL*     1.3    61.4    +      -       -      +
    182A  ALA*     3.4     8.1    +      -       -      +
    183A  LEU*     3.3    23.7    +      -       -      +
    192A  ASN*     4.4     1.9    -      -       -      +
    250A  GLY*     3.6    23.3    -      -       -      +
    158B  LEU      5.0     2.3    +      -       -      +
    160B  PRO*     3.8    31.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 180 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176A  MET*     3.0    19.6    +      -       -      +
    177A  LEU      3.5     6.5    -      -       -      +
    179A  GLN*     1.3    73.1    -      -       -      +
    181A  LEU*     1.3    64.8    -      -       -      +
    183A  LEU*     3.0     8.8    +      -       -      +
    184A  GLU*     3.0    40.3    +      -       +      +
    108B  PHE*     4.8     0.2    -      -       +      -
    160B  PRO*     4.0    19.5    -      -       +      -
    161B  PHE      3.6    22.9    -      -       -      +
    163B  GLY      4.2     0.9    -      -       -      +
    165B  ALA*     3.8    34.5    -      -       +      +
    168B  CYS*     4.1    16.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 181 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132A  THR*     3.9    11.2    -      -       +      -
    136A  LEU*     3.8    13.9    -      -       +      -
    149A  VAL*     3.7    29.8    -      -       +      -
    177A  LEU      2.9    13.8    +      -       -      +
    178A  PHE*     3.6    13.2    -      -       +      +
    180A  VAL*     1.3    77.6    -      -       -      +
    182A  ALA*     1.3    58.0    +      -       -      +
    184A  GLU*     4.4     2.7    -      -       -      +
    185A  GLU*     2.8    55.2    +      -       +      +
    188A  VAL*     4.9     1.1    -      -       +      -
    190A  VAL*     4.0     9.0    -      -       +      -
    108B  PHE*     3.5    46.8    -      -       +      -
    109B  VAL*     5.2     0.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 182 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    178A  PHE      2.9    17.0    +      -       -      +
    179A  GLN      3.6     6.3    -      -       -      +
    180A  VAL      3.2     0.4    -      -       -      -
    181A  LEU*     1.3    76.0    -      -       -      +
    183A  LEU*     1.3    63.1    +      -       +      +
    185A  GLU      3.9    14.4    -      -       -      +
    186A  PRO*     4.0     6.8    -      -       -      +
    190A  VAL*     3.9    11.7    -      -       +      -
    249A  SER*     3.6    28.9    +      -       -      +
    250A  GLY*     3.7    20.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 183 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179A  GLN      3.3     8.6    +      -       -      +
    180A  VAL      3.0     9.3    +      -       -      +
    182A  ALA*     1.3    82.0    -      -       +      +
    184A  GLU*     1.3    60.5    -      -       -      +
    185A  GLU      3.7     0.2    +      -       -      -
    186A  PRO*     4.2    10.6    -      -       -      +
    160B  PRO*     3.7    41.5    -      -       +      +
    161B  PHE*     4.3     0.9    -      -       -      -
    162B  LYS*     3.7    45.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    180A  VAL*     3.0    25.8    +      -       +      +
    181A  LEU*     3.8     5.6    -      -       -      +
    183A  LEU*     1.3    78.6    -      -       -      +
    185A  GLU*     1.3    75.3    +      -       +      +
    186A  PRO*     3.2    10.1    -      -       -      +
    107B  GLY*     3.3     8.8    -      -       -      -
    108B  PHE*     2.8    42.5    +      -       +      +
    109B  VAL      4.7     0.9    +      -       -      -
    162B  LYS*     4.1    14.1    -      -       +      -
    163B  GLY*     3.1    35.9    +      -       -      +
    165B  ALA*     4.9     0.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  LEU*     5.3     0.9    -      -       +      -
    147A  ARG*     3.8    18.9    +      -       -      -
    181A  LEU*     2.8    33.0    +      -       +      +
    182A  ALA*     3.9     6.1    -      -       -      +
    184A  GLU*     1.3    90.1    -      -       +      +
    186A  PRO*     1.3    62.9    -      -       -      +
    187A  ASN*     3.1     5.5    +      -       -      +
    188A  VAL*     2.8    43.3    +      -       +      +
    108B  PHE*     5.8     0.4    -      -       +      -
    109B  VAL*     3.7    25.5    -      -       +      +
----------------------------------------------------------
 Back to top of page


A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il